/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// conproc.c

#include <windows.h>
#include "conproc.h"
#include "quakedef.h"

HANDLE	heventDone;
HANDLE	hfileBuffer;
HANDLE	heventChildSend;
HANDLE	heventParentSend;
HANDLE	hStdout;
HANDLE	hStdin;

DWORD RequestProc (DWORD dwNichts);
LPVOID GetMappedBuffer (HANDLE fileBuffer);
void ReleaseMappedBuffer (LPVOID pBuffer);
BOOL GetScreenBufferLines (int *piLines);
BOOL SetScreenBufferLines (int iLines);
BOOL ReadText (LPTSTR pszText, int iBeginLine, int iEndLine);
BOOL WriteText (LPCTSTR szText);
int CharToCode (char c);
BOOL SetConsoleCXCY(HANDLE Stdout, int cx, int cy);


void InitConProc (HANDLE hFile, HANDLE heventParent, HANDLE heventChild)
{
    DWORD	dwID;

// ignore if we don't have all the events.
    if (!hFile || !heventParent || !heventChild) return;

    hfileBuffer = hFile;
    heventParentSend = heventParent;
    heventChildSend = heventChild;

// so we'll know when to go away.
    heventDone = CreateEvent (NULL, FALSE, FALSE, NULL);

    if (!heventDone)
    {
        Con_SafePrintf ("Couldn't create heventDone\n");
        return;
    }

    if (!CreateThread (NULL,
                       0,
                       (LPTHREAD_START_ROUTINE) RequestProc,
                       0,
                       0,
                       &dwID))
    {
        CloseHandle (heventDone);
        Con_SafePrintf ("Couldn't create QHOST thread\n");
        return;
    }

// save off the input/output handles.
    hStdout = GetStdHandle (STD_OUTPUT_HANDLE);
    hStdin = GetStdHandle (STD_INPUT_HANDLE);

// force 80 character width, at least 25 character height
    SetConsoleCXCY (hStdout, 80, 25);
}


void DeinitConProc (void)
{
    if (heventDone)
        SetEvent (heventDone);
}


DWORD RequestProc (DWORD dwNichts)
{
    int		*pBuffer;
    DWORD	dwRet;
    HANDLE	heventWait[2];
    int		iBeginLine, iEndLine;

    heventWait[0] = heventParentSend;
    heventWait[1] = heventDone;

    while (1)
    {
        dwRet = WaitForMultipleObjects (2, heventWait, FALSE, INFINITE);

        // heventDone fired, so we're exiting.
        if (dwRet == WAIT_OBJECT_0 + 1)
            break;

        pBuffer = (int *) GetMappedBuffer (hfileBuffer);

        // hfileBuffer is invalid.  Just leave.
        if (!pBuffer)
        {
            Con_SafePrintf ("Invalid hfileBuffer\n");
            break;
        }

        switch (pBuffer[0])
        {
        case CCOM_WRITE_TEXT:
            // Param1 : Text
            pBuffer[0] = WriteText ((LPCTSTR) (pBuffer + 1));
            break;

        case CCOM_GET_TEXT:
            // Param1 : Begin line
            // Param2 : End line
            iBeginLine = pBuffer[1];
            iEndLine = pBuffer[2];
            pBuffer[0] = ReadText ((LPTSTR) (pBuffer + 1), iBeginLine,
                                   iEndLine);
            break;

        case CCOM_GET_SCR_LINES:
            // No params
            pBuffer[0] = GetScreenBufferLines (&pBuffer[1]);
            break;

        case CCOM_SET_SCR_LINES:
            // Param1 : Number of lines
            pBuffer[0] = SetScreenBufferLines (pBuffer[1]);
            break;

        default:
            break;
        }
        ReleaseMappedBuffer (pBuffer);
        SetEvent (heventChildSend);
    }
    return 0;
}


LPVOID GetMappedBuffer (HANDLE fileBuffer)
{
    LPVOID pBuffer;

    pBuffer = MapViewOfFile (fileBuffer, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);

    return pBuffer;
}


void ReleaseMappedBuffer (LPVOID pBuffer)
{
    UnmapViewOfFile (pBuffer);
}


BOOL GetScreenBufferLines (int *piLines)
{
    CONSOLE_SCREEN_BUFFER_INFO	info;
    BOOL						bRet;

    bRet = GetConsoleScreenBufferInfo (hStdout, &info);

    if (bRet)
        *piLines = info.dwSize.Y;

    return bRet;
}


BOOL SetScreenBufferLines (int iLines)
{

    return SetConsoleCXCY (hStdout, 80, iLines);
}


BOOL ReadText (LPTSTR pszText, int iBeginLine, int iEndLine)
{
    COORD	coord;
    DWORD	dwRead;
    BOOL	bRet;

    coord.X = 0;
    coord.Y = iBeginLine;

    bRet = ReadConsoleOutputCharacter(
               hStdout,
               pszText,
               80 * (iEndLine - iBeginLine + 1),
               coord,
               &dwRead);

    // Make sure it's null terminated.
    if (bRet)
        pszText[dwRead] = '\0';

    return bRet;
}


BOOL WriteText (LPCTSTR szText)
{
    DWORD			dwWritten;
    INPUT_RECORD	rec;
    char			upper, *sz;

    sz = (LPTSTR) szText;

    while (*sz)
    {
        // 13 is the code for a carriage return (\n) instead of 10.
        if (*sz == 10)
            *sz = 13;

        upper = toupper(*sz);

        rec.EventType = KEY_EVENT;
        rec.Event.KeyEvent.bKeyDown = TRUE;
        rec.Event.KeyEvent.wRepeatCount = 1;
        rec.Event.KeyEvent.wVirtualKeyCode = upper;
        rec.Event.KeyEvent.wVirtualScanCode = CharToCode (*sz);
        rec.Event.KeyEvent.uChar.AsciiChar = *sz;
        rec.Event.KeyEvent.uChar.UnicodeChar = *sz;
        rec.Event.KeyEvent.dwControlKeyState = isupper(*sz) ? 0x80 : 0x0;

        WriteConsoleInput(
            hStdin,
            &rec,
            1,
            &dwWritten);

        rec.Event.KeyEvent.bKeyDown = FALSE;

        WriteConsoleInput(
            hStdin,
            &rec,
            1,
            &dwWritten);

        sz++;
    }

    return TRUE;
}


int CharToCode (char c)
{
    char upper;

    upper = toupper(c);

    switch (c)
    {
    case 13:
        return 28;

    default:
        break;
    }

    if (isalpha(c))
        return (30 + upper - 65);

    if (isdigit(c))
        return (1 + upper - 47);

    return c;
}


BOOL SetConsoleCXCY(HANDLE Stdout, int cx, int cy)
{
    CONSOLE_SCREEN_BUFFER_INFO	info;
    COORD						coordMax;

    coordMax = GetLargestConsoleWindowSize(Stdout);

    if (cy > coordMax.Y)
        cy = coordMax.Y;

    if (cx > coordMax.X)
        cx = coordMax.X;

    if (!GetConsoleScreenBufferInfo(Stdout, &info))
        return FALSE;

// height
    info.srWindow.Left = 0;
    info.srWindow.Right = info.dwSize.X - 1;
    info.srWindow.Top = 0;
    info.srWindow.Bottom = cy - 1;

    if (cy < info.dwSize.Y)
    {
        if (!SetConsoleWindowInfo(Stdout, TRUE, &info.srWindow))
            return FALSE;

        info.dwSize.Y = cy;

        if (!SetConsoleScreenBufferSize(Stdout, info.dwSize))
            return FALSE;
    }
    else if (cy > info.dwSize.Y)
    {
        info.dwSize.Y = cy;

        if (!SetConsoleScreenBufferSize(Stdout, info.dwSize))
            return FALSE;

        if (!SetConsoleWindowInfo(Stdout, TRUE, &info.srWindow))
            return FALSE;
    }

    if (!GetConsoleScreenBufferInfo(Stdout, &info))
        return FALSE;

// width
    info.srWindow.Left = 0;
    info.srWindow.Right = cx - 1;
    info.srWindow.Top = 0;
    info.srWindow.Bottom = info.dwSize.Y - 1;

    if (cx < info.dwSize.X)
    {
        if (!SetConsoleWindowInfo(Stdout, TRUE, &info.srWindow))
            return FALSE;

        info.dwSize.X = cx;

        if (!SetConsoleScreenBufferSize(Stdout, info.dwSize))
            return FALSE;
    }
    else if (cx > info.dwSize.X)
    {
        info.dwSize.X = cx;

        if (!SetConsoleScreenBufferSize(Stdout, info.dwSize))
            return FALSE;

        if (!SetConsoleWindowInfo(Stdout, TRUE, &info.srWindow))
            return FALSE;
    }
    return TRUE;
}

